Connect Drive in Windows Explorer

Windows has WebDAV built in, so you can map TrekMail Drive as a network drive without installing anything. Once mapped, it appears under This PC with its own drive letter, drag files in, open them from any app, save, and changes upload automatically.

Connection details

What Windows "Map network drive" wizard asks for:

If you haven't generated a device password yet, do that first: see Sync devices.

Before you start

You need a device password. Sync apps get their own one-time password, separate from your dashboard login. That way you can revoke sync access without changing your main password.

1. Open Sync devices in your TrekMail dashboard.
2. Click + Add new device.
3. Name it (e.g. Work PC, Explorer).
4. Leave View files and Edit files checked.
5. Click Generate password and copy the password (starts with dsync_).

Map the network drive

1. Open File Explorer (press Win + E).
2. In the left sidebar, right-click This PC and pick Map network drive….
3. Pick a drive letter (any free one, D:, T:, Z: are common).
4. In the Folder field, paste the complete Drive server URL shown at the top of the Sync devices page. Copy it directly rather than constructing a URL yourself.
5. Check Reconnect at sign-in so the drive comes back after restarts.
6. Check Connect using different credentials.
7. Click Finish. Windows asks for credentials.
8. Enter:
   • User name: your TrekMail account email
   • Password: the device password (dsync_...)
9. Check Remember my credentials, then click OK.

Your Drive opens in a new window. It now lives under This PC with the drive letter you picked.

Working with files

• Drag files into the drive window. They upload as you drop them.
• Open documents from Office apps: for an existing Drive file, save a new version locally and upload it as a new file, or update it in the Drive web interface. WebDAV does not replace an existing file with a direct save.
• Right-click → New → Folder works like any folder.
• Delete moves to Drive's trash. Restore from the dashboard within 30 days.

For a large file, test the connection with a smaller file first and keep Explorer open until the transfer completes. Drive supports files up to 10 TB, subject to available storage and the capabilities of the client.

Enable large-file uploads (one-time Windows tweak)

By default, Windows itself refuses WebDAV uploads larger than 50 MB at the OS level. This is a Microsoft default, unrelated to TrekMail. To lift it:

1. Press Win + R, type regedit, press Enter.
2. Navigate to:

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WebClient\Parameters
   

3. Double-click FileSizeLimitInBytes.
4. Pick Decimal and enter 4294967295 (~4 GB, the maximum Windows allows).
5. Click OK, then restart your PC (or restart the WebClient service from Services).

For files that Windows WebClient still cannot transfer reliably after this change, use rclone or another client that fits your workflow.

Troubleshooting

• "The network folder specified is currently mapped": Windows already has a connection. Open Command Prompt and run net use * /delete /y, then re-map.
• "The folder name is not valid": copy the complete URL again from Sync devices and make sure it begins with https://.
• "The mapped drive could not be created": Windows WebClient service is stopped. Open Services, find WebClient, set it to Automatic and start it.
• Slow on large files: Windows WebDAV transfers chunk-by-chunk in serial. Use rclone for big uploads.
• Login keeps prompting: Windows sometimes drops cached credentials. Remap and re-check Remember my credentials.

For broader sync issues, see Drive Sync troubleshooting.